MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(All curves generated using the inverter circuit shown in the
Typical Operating Circuits
with LV = GND and T
A
= +25°C, unless other-
wise noted. Test results also valid for doubler mode with LV = OUT and T
A
= +25°C. All capacitor values used are those recom-
mended in Table 3, unless otherwise noted. The output resistance curves represent the resistance of the device itself, which is R
O
in
the equation for R
OUT
shown in the
Capacitor Selection
section.)
0.7
0
0
OUTPUT VOLTAGE DROP FROM
SUPPLY VOLTAGE vs. LOAD CURRENT
0.8
MAX860-01
LOAD CURRENT (mA)
V
OUT
DROP (V)
30
0.4
0.2
10 20 50
0.6
40
0.1
0.3
0.5
V
DD
= +1.5V
V
DD
= +2.5V
V
DD
= +3.5V
V
DD
= +4.5V, +5.0V
V
DD
= +5.5V
ALL FREQUENCIES
2
-14
1.5 2.0 3.0 4.0
OSCILLATOR FREQUENCY vs.
SUPPLY VOLTAGE
-6
0
MAX860-02
SUPPLY VOLTAGE (V)
PERCENTAGE FREQUENCY CHANGE (%)
(FROM FREQUENCY MEASURED WITH V
DD
= +5V)
2.5 3.5
-2
-4
4.5 5.0 5.5
-8
-10
-12
ALL FREQUENCIES,
LV CONNECTED TO GND
(INVERTER) OR OUT (DOUBLER)
1.0
20
0
01 3 5
OUTPUT SOURCE RESISTANCE (R
O
) vs.
SUPPLY VOLTAGE
4
16
MAX860-03
SUPPLY VOLTAGE (V)
OUTPUT SOURCE RESISTANCE (Ω)
24
12
8
2
6
10
14
18
ALL FREQUENCIES
32
0
-60 -20 40 140
OUTPUT SOURCE RESISTANCE (R
O
) vs.
TEMPERATURE
8
28
MAX860-04
TEMPERATURE (°C)
OUTPUT SOURCE RESISTANCE (Ω)
20 100
24
16
-40 0 60 80 120
20
12
4
V
DD
= +3V
V
DD
= +5V
V
DD
= +1.5V
ALL FREQUENCIES
0
0
MAX861 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX860-07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
100
200
300
500
123456
400
DOUBLER, LV = OUT
INVERTER, LV = GND
FC = V
DD
100
0
0.01 1 100
MAX860
EFFICIENCY vs. LOAD CURRENT
20
MAX860-05
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
10
30
50
70
90
0.1 10
INVERTER
FC = V
DD
V
DD
= +1.5V
V
DD
= +3V
V
DD
= +5V
0
0
MAX860 SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX860-06
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
100
200
300
500
123456
400
DOUBLER, LV = OUT
INVERTER, LV = GND
(V
DD
> 3V)
FC = V
DD
70
0
0.33
MAX860 OUTPUT CURRENT vs. CAPACITANCE
HIGH-FREQUENCY MODE
MAX860-08
CAPACITANCE (µF)
OUTPUT CURRENT (mA)
4.7
40
20
1 2.2 22
60
10
10
30
50
V
IN
= +4.5V, V
OUT
= -3.5V
V
IN
= +4.5V, V
OUT
= -4V
V
IN
= +3V, V
OUT
= -2.4V
V
IN
= +3V, V
OUT
= -2.7V
f
OSC
= 130kHz
FC = OUT
LV = GND
INVERTER MODE
80
70
0
0.33
MAX860 OUTPUT CURRENT vs. CAPACITANCE
MEDIUM-FREQUENCY MODE
MAX860-09
CAPACITANCE (µF)
OUTPUT CURRENT (mA)
4.7
40
20
1 2.2 22
60
10
10
30
50
V
IN
= +4.5V, V
OUT
= -3.5V
V
IN
= +3V, V
OUT
= -2.4V
V
IN
= +4.5V, V
OUT
= -4V
V
IN
= +3V, V
OUT
= -2.7V
f
OSC
= 50kHz
FC = GND
LV = GND
INVERTER MODE
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